Note this is our development site. The license for Ajax Search Pro is on the live site stewartmckelvey.com. I tested this under the licensed version, too and it’s not working.
We have a search filter on this page (Find a Professional):
https://peiwebsolutions.thedev.ca/stewartmckelvey2/our-team/
The open search field (Name) is set to search a Custom Post Type Title and I’ve added a custom field ‘_nickname’ to be included in that field search. Used these instructions: https://documentation.ajaxsearchpro.com/general-settings/search-in-custom-fields
However, the nickname field does not appear to be picking up.
I didn’t disable other plugins since the search works great otherwise. That doesn’t appear to be a likely issue. No error log messages are generated.
If you search for ‘charles’ or ‘harold’ you will get results. These are in the post titles. However, if you search for ‘chuck’ or ‘harry’, you get no results. These are in the nickname custom field.